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authorChristoph Hellwig <hch@lst.de>2018-05-09 17:04:51 +0300
committerMatt Turner <mattst88@gmail.com>2018-05-23 04:10:36 +0300
commit6db615431a21b6057f68ed87583a663ee69f7601 (patch)
treeb785afbe9eb7ebfda71fc8ff452714a25e549119 /arch
parentc61a56ababa404961fa769a2b24229f18e461961 (diff)
downloadlinux-6db615431a21b6057f68ed87583a663ee69f7601.tar.xz
alpha: use dma_direct_ops for jensen
The generic dma_direct implementation does the same thing as the alpha pci-noop implementation, just with more bells and whistles. And unlike the current code it at least has a theoretical chance to actually compile. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Matt Turner <mattst88@gmail.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/alpha/Kconfig1
-rw-r--r--arch/alpha/include/asm/dma-mapping.h4
-rw-r--r--arch/alpha/kernel/pci-noop.c33
3 files changed, 5 insertions, 33 deletions
diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index b2022885ced8..f19dc31288c8 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -211,6 +211,7 @@ config ALPHA_EIGER
config ALPHA_JENSEN
bool "Jensen"
depends on BROKEN
+ select DMA_DIRECT_OPS
help
DEC PC 150 AXP (aka Jensen): This is a very old Digital system - one
of the first-generation Alpha systems. A number of these systems
diff --git a/arch/alpha/include/asm/dma-mapping.h b/arch/alpha/include/asm/dma-mapping.h
index b78f61f20796..76ce923ecca1 100644
--- a/arch/alpha/include/asm/dma-mapping.h
+++ b/arch/alpha/include/asm/dma-mapping.h
@@ -6,7 +6,11 @@ extern const struct dma_map_ops *dma_ops;
static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
{
+#ifdef CONFIG_ALPHA_JENSEN
+ return &dma_direct_ops;
+#else
return dma_ops;
+#endif
}
#endif /* _ALPHA_DMA_MAPPING_H */
diff --git a/arch/alpha/kernel/pci-noop.c b/arch/alpha/kernel/pci-noop.c
index b6ebb65127a8..c7c5879869d3 100644
--- a/arch/alpha/kernel/pci-noop.c
+++ b/arch/alpha/kernel/pci-noop.c
@@ -102,36 +102,3 @@ SYSCALL_DEFINE5(pciconfig_write, unsigned long, bus, unsigned long, dfn,
else
return -ENODEV;
}
-
-static void *alpha_noop_alloc_coherent(struct device *dev, size_t size,
- dma_addr_t *dma_handle, gfp_t gfp,
- unsigned long attrs)
-{
- void *ret;
-
- if (!dev || *dev->dma_mask >= 0xffffffffUL)
- gfp &= ~GFP_DMA;
- ret = (void *)__get_free_pages(gfp, get_order(size));
- if (ret) {
- memset(ret, 0, size);
- *dma_handle = virt_to_phys(ret);
- }
- return ret;
-}
-
-static int alpha_noop_supported(struct device *dev, u64 mask)
-{
- return mask < 0x00ffffffUL ? 0 : 1;
-}
-
-const struct dma_map_ops alpha_noop_ops = {
- .alloc = alpha_noop_alloc_coherent,
- .free = dma_noop_free_coherent,
- .map_page = dma_noop_map_page,
- .map_sg = dma_noop_map_sg,
- .mapping_error = dma_noop_mapping_error,
- .dma_supported = alpha_noop_supported,
-};
-
-const struct dma_map_ops *dma_ops = &alpha_noop_ops;
-EXPORT_SYMBOL(dma_ops);